/Engine/Source/Editor/UnrealEd/Classes/Editor/EditorEngine.h
Returns a filter to restruct what assets show up in asset pickers based on what the selection is used for (i.e. what will reference the assets)
typedef TBaseDelegate_OneParam< [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [IAssetReferenceFilter](API\Editor\UnrealEd\Editor\IAssetReferenceFilter) >, const [FAssetReferenceFilterContext](API\Editor\UnrealEd\Editor\FAssetReferenceFilterContext) & > FOnMakeAssetReferenceFilter